Dai Xiaonan

yes, it is decided by an intrinsic attribut called "closed" on prim.
use the function setprimintrisic(0,'closed',0,1) to manipulate it.

shadyellaithy
the issue is that i cannot find from my imported file the secound uv set on my geo , so i guess something missing while i export my maya file

I guess it is because maya exports uv attribute in vector2, and Houdini will only recognize uv attribute in vector3. I export my uv sets in alembic(check write uv and uv sets), I am not sure if the same thing happens in USD. Houdini will not treat a vector2 attribut as a uv attribute even it was named with 'uv' prefix or marked with 'texturecoord', as tamte mentioned, thanks by the way.
Just create a attribute wrangle and run in vertices mode.

Hope it will help you.

replace your mtlx standard surface with a unlit surface, link your pattern into it.